std::experimental::optional::operator bool

constexpr explicit operator bool() const;		(library fundamentals TS)

Checks whether *this contains a value.

(none)

true if *this contains a value, false if *this does not contain a value.

noexcept specification:

noexcept

Language
Standard library headers
Concepts
Utilities library
Strings library
Containers library
Algorithms library
Iterators library
Numerics library
Input/output library
Localizations library
Regular expressions library (C++11)
Atomic operations library (C++11)
Thread support library (C++11)
Filesystem library (C++17)
Technical Specifications

Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals 2 TS)
Extensions for parallelism (parallelism TS)
Extensions for concurrency (concurrency TS)
Concepts (concepts TS)
Ranges (ranges TS)
Special mathematical functions (special math TR)

experimental::optional
experimental::any
experimental::basic_string_view
experimental::sample
experimental::shared_ptr
experimental::weak_ptr
experimental::apply
experimental::invocation_type experimental::raw_invocation_type
experimental::search
experimental::default_searcher experimental::make_default_searcher
experimental::boyer_moore_searcher experimental::make_boyer_moore_searcher
experimental::boyer_moore_horspool_searcher experimental::make_boyer_moore_horspool_searcher
type-erased and polymorphic allocators
variable templates for type traits

Member functions
optional::optional
optional::~optional
optional::operator=
Observers
optional::operator->optional::operator*
optional::operator bool
optional::value
optional::value_or
Modifiers
optional::emplace
optional::swap
Non-member functions
operator==operator!=operator<operator<=operator>operator>=
make_optional
swap
Helper classes
hash
nullopt_t
in_place_t
bad_optional_access
Helper objects
nullopt
in_place